Fair Value Measurements (Summary Of Carrying Value And Fair Value Estimate Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	May 02, 2015		Jan. 31, 2015		May 03, 2014
Fair Value Measurements, Long-term Debt [Line Items]
Carrying value of long-term debt	$ 3,146	[1]	$ 3,131	[1]	$ 3,117	[1]
Level 2 [Member]
Fair Value Measurements, Long-term Debt [Line Items]
Fair value of long-term debt	$ 3,606		$ 3,693		$ 3,547

[1] The carrying value of long-term debt includes the remaining unamortized adjustment from our previous effective fair value hedge.